1、自定义拦截器
创建自定义拦截器类，实现ProducerInterceptor接口。对消息进行拦截，可以在拦截中对消息做些处理，记录日志等操作…
package com.power.config;import org.apache.kafka.clients.producer.ProducerInterceptor;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;import java.util.Map;public class CustomerProducerInterceptor implements ProducerInterceptor<String,Object> {/*** 发送消息时，会调用该方法，对消息进行拦截，可以在拦截中对消息做些处理，记录日志等操作......* @param record* @return*/@Overridepublic ProducerRecord<String,Object> onSend(ProducerRecord record) {System.out.println("拦截消息："+record.toString());return record;}/*** 服务器收到消息后的一个确认* @param metadata* @param exception*/@Overridepublic void onAcknowledgement(RecordMetadata metadata, Exception exception) {if(null!=metadata){System.out.println("服务器接收到该消息："+metadata.toString());}else {System.out.println("消息发送失败了,exception = "+exception);}}@Overridepublic void close() {}@Overridepublic void configure(Map<String, ?> configs) {}
}
2、kafak配置类
package com.power.config;import org.apache.kafka.clients.admin.NewTopic;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.RoundRobinPartitioner;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.core.DefaultKafkaProducerFactory;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.core.ProducerFactory;import java.util.HashMap;
import java.util.Map;@Configuration
public class KafkaConfig {@Value("${spring.kafka.bootstrap-servers}")private String bootstrapServers;@Value("${spring.kafka.producer.key-serializer}")private String keySerializer;@Value("${spring.kafka.producer.value-serializer}")private String valueSerializer;public Map<String, Object> producerConfigs() {Map<String, Object> props = new HashMap<>();props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, keySerializer);props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, valueSerializer);props.put(ProducerConfig.PARTITIONER_CLASS_CONFIG, CustomerPartitioner.class);props.put(ProducerConfig.INTERCEPTOR_CLASSES_CONFIG,CustomerProducerInterceptor.class.getName());return props;}public ProducerFactory<String, ?> producerFactory() {return new DefaultKafkaProducerFactory<>(producerConfigs());}@Beanpublic KafkaTemplate<String, ?> kafkaTemplate() {return new KafkaTemplate<>(producerFactory());}//第二次创建@Beanpublic NewTopic newTopic9() {return new NewTopic("heTopic", 9, (short) 1);}
}
3、生产者
package com.power.producer;import com.power.model.User;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.header.Headers;
import org.apache.kafka.common.header.internals.RecordHeaders;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.support.KafkaHeaders;
import org.springframework.kafka.support.SendResult;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.stereotype.Component;
import org.springframework.util.concurrent.ListenableFuture;import javax.annotation.Resource;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;@Component
public class EventProducer {@Resourceprivate KafkaTemplate<String,Object> kafkaTemplate2;public void send10(){User user = User.builder().id(1208).phone("16767667676").birthday(new Date()).build();//分区是null，让kafka自己去决定把消息发送到哪个分区kafkaTemplate2.send("heTopic",user);}
}
4、测试类
package com.power;import com.power.model.User;
import com.power.producer.EventProducer;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;import javax.annotation.Resource;
import java.util.Date;@SpringBootTest
public class SpringBoot01KafkaBaseApplication {@Resourceprivate EventProducer eventProducer;@Testvoid sendInterceptor(){eventProducer.send10();}}
5、执行测试类
